refactor(editor): split openFileOrFiles into openSingleFileWith and openFilesWith (#12523)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
	- Improved file selection dialogs for attachments, imports, and uploads, allowing for more consistent and streamlined file picking across the app.

- **Bug Fixes**
	- Resolved inconsistencies when selecting single or multiple files, ensuring a smoother user experience during file import and upload.

- **Refactor**
	- Unified and simplified file selection logic throughout the app for better reliability and maintainability.
	- Standardized import functions to uniformly handle arrays of files, enhancing consistency in file processing.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/widgets/keyboard-toolbar/src/config.ts

@@ -48,7 +48,7 @@ import { REFERENCE_NODE } from '@blocksuite/affine-shared/consts';
 import type { AffineTextAttributes } from '@blocksuite/affine-shared/types';
 import {
   createDefaultDoc,
-  openFileOrFiles,
+  openSingleFileWith,
   type Signal,
 } from '@blocksuite/affine-shared/utils';
 import type { AffineLinkedDocWidget } from '@blocksuite/affine-widget-linked-doc';
@@ -418,7 +418,7 @@ const contentMediaToolGroup: KeyboardToolPanelGroup = {
         const model = selectedModels?.[0];
         if (!model) return;
 
-        const file = await openFileOrFiles();
+        const file = await openSingleFileWith();
         if (!file) return;
 
         await addSiblingAttachmentBlocks(std, [file], model);
@@ -1040,7 +1040,7 @@ export const defaultKeyboardToolbarConfig: KeyboardToolbarConfig = {
         const model = selectedModels?.[0];
         if (!model) return;
 
-        const file = await openFileOrFiles();
+        const file = await openSingleFileWith();
         if (!file) return;
 
         await addSiblingAttachmentBlocks(std, [file], model);

blocksuite/affine/widgets/linked-doc/src/import-doc/import-doc.ts

@@ -6,7 +6,10 @@ import {
   NewIcon,
   NotionIcon,
 } from '@blocksuite/affine-components/icons';
-import { openFileOrFiles } from '@blocksuite/affine-shared/utils';
+import {
+  openFilesWith,
+  openSingleFileWith,
+} from '@blocksuite/affine-shared/utils';
 import { WithDisposable } from '@blocksuite/global/lit';
 import type { ExtensionType, Schema, Workspace } from '@blocksuite/store';
 import { html, LitElement, type PropertyValues } from 'lit';
@@ -50,7 +53,7 @@ export class ImportDoc extends WithDisposable(LitElement) {
   }
 
   private async _importHtml() {
-    const files = await openFileOrFiles({ acceptType: 'Html', multiple: true });
+    const files = await openFilesWith('Html');
     if (!files) return;
     const pageIds: string[] = [];
     for (const file of files) {
@@ -79,10 +82,7 @@ export class ImportDoc extends WithDisposable(LitElement) {
   }
 
   private async _importMarkDown() {
-    const files = await openFileOrFiles({
-      acceptType: 'Markdown',
-      multiple: true,
-    });
+    const files = await openFilesWith('Markdown');
     if (!files) return;
     const pageIds: string[] = [];
     for (const file of files) {
@@ -111,7 +111,7 @@ export class ImportDoc extends WithDisposable(LitElement) {
   }
 
   private async _importNotion() {
-    const file = await openFileOrFiles({ acceptType: 'Zip' });
+    const file = await openSingleFileWith('Zip');
     if (!file) return;
     const needLoading = file.size > SHOW_LOADING_SIZE;
     if (needLoading) {